Sidebar menu doesn't get initialised for first root controller in 5.2

[Oglan]

Steps to reproduce

1. Run MvvmCross.iOS.Support.XamarinSidebarSample.iOS project from main MvvmCross solution.

Expected behavior

Menu icon should be visible.
Left menu should appear if swiping from left side.

Actual behavior

There is no menu icon in the top left corner.
Menu is appearing if swiping from right side.

Configuration

Version: 5.2.0

Platform:

• iOS
• Android
• WPF
• UWP

[Oglan]

Call stack for the first time presentation of the root controller with sidebar presentation attribute(MvxSidebarPresentation(MvxPanelEnum.Center, MvxPanelHintType.ResetRoot...)):

1. MvxSidebarPresenter.ShowSidebarViewController
2. MvxSidebarViewController.ctor
3. ShowMenuButton extension from MvxSidebarPresenter.ShowPanelAndResetToRoot // left and right panels are nulls here, as result there is no information about icons yet
4. MvxSidebarViewController.ViewDidLoad
5. MvxSidebarViewController.SetupSideMenu // left and right panels are being initialised here

[Oglan]

Workaround: call ShowMenuButton from ViewDidLoad of the first root view. For this we have to have access to SideBarViewController. It is accessible for derived ViewPresenters only.

// declare custom presenter
public class MyPresenter : MvxSidebarPresenter
{
    public MvxSidebarViewController SideBar => SideBarViewController as MvxSidebarViewController;
    public MyPresenter(IUIApplicationDelegate appDelegate, UIWindow window) : base(appDelegate, window)
    {
    }
}

// replace presenter in Setup.cs
protected override IMvxIosViewPresenter CreatePresenter()
{
    return new MyPresenter((MvxApplicationDelegate)ApplicationDelegate, Window);
}

// initialize menu from initial root view controller
public override void ViewDidLoad()
{
    // ...
    this.ShowMenuButton(((MyPresenter)Mvx.Resolve<IMvxIosViewPresenter>()).SideBar);
}